CN214069817U - High-power flyback switching power supply - Google Patents
High-power flyback switching power supply Download PDFInfo
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- CN214069817U CN214069817U CN202023226272.3U CN202023226272U CN214069817U CN 214069817 U CN214069817 U CN 214069817U CN 202023226272 U CN202023226272 U CN 202023226272U CN 214069817 U CN214069817 U CN 214069817U
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Abstract
The utility model discloses a high-power flyback switching power supply, including input module, main control module and the output module who connects in order, input module and external power source are connected, and output module is the load power supply, main control module includes drive chip U2, transformer T1, MOS pipe Q1, resistance R5-7, 12, 15, 25, 26, 27, diode D5, 8, stabilivolt VR3 and electric capacity CA 2; the resistors R5-7 and 12 are connected in parallel to reduce sampling voltage, the problem that the sampling resistor generates heat after the current is increased is solved, the voltage stabilizing tube VR3 is added to clamp a power supply pin of the driving chip U2, the driving chip U2 cannot enter overvoltage protection, the peak absorption resistor structure is improved, the absorption depth can be increased, the problem of high power consumption after the absorption depth is increased is solved, and the requirement that the switching power supply can output high power to meet the power amplifier of the sound equipment is met.
Description
Technical Field
The utility model relates to a switching power supply field, in particular to high-power flyback switching power supply.
Background
In the switching power supply of the sound power amplifier, the output power of the common flyback voltage is 120W, and the limit of the design is reached, and when the power is larger, the following problems can be caused: 1. the output is 15V, and under the condition that the current output is increased, because of the existence of leakage inductance of the transformer, the peak of the cut-off period of the switching tube becomes dark, and the switching tube is damaged when the peak exceeds the withstand voltage value of the switching tube flexibly; 2. the peak of the voltage of the feedback winding is increased along with the increase of the output power, and when the voltage of a capacitor connected with a power supply pin of the power supply drive IC exceeds 33V, the overvoltage protection of the power supply drive IC is triggered; 3. when the power is increased, the current of the switching tube is also increased, so that the sampling voltage exceeds a 0.9V protection point, and overcurrent protection is caused; based on the above problems, a high-power flyback switching power supply needs to be designed to output a larger power, so as to meet the requirement of a sound power amplifier.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a high-power flyback switching power supply.
The utility model discloses a technical scheme that its technical problem was solved to an embodiment adopted is: a high-power flyback switching power supply comprises an input module, a main control module and an output module which are connected in sequence, wherein the input module is connected with an external power supply, the output module supplies power for a load, the main control module comprises a driving chip U2, a transformer T1, an MOS tube Q1, resistors R5-7, 12, 15, 25, 26 and 27, diodes D5 and 8, a voltage regulator VR3 and a capacitor CA2, one end of the resistor R12 is connected with one output end of the input module, one end of the resistor R25, one end of the resistor R15, one end of the resistor R26, the cathode of the diode D5, the cathode of the diode D8 and one end of a primary winding of the transformer, the other end of the resistor R12 is connected with the other end of the resistor R15, the other end of the resistor R26 and the other end of the resistor R25 respectively, the anode of the diode D5 is connected with the anode of the diode D8, the other end of the primary winding of the transformer T1 and the drain of the MOS tube Q1 respectively, The power supply circuit comprises a source electrode, a grid electrode, one end of a resistor R6, one end of a resistor R5, one end of a resistor R7, one end of a resistor R27, an output pin and a chip selection pin of a driving chip U2, the other end of a resistor R6 is connected with one end of a transformer T1 feedback winding, the other end of a resistor R5, the other end of a resistor R7, the other end of a resistor R27, a grounding end and the chip selection pin of the driving chip U2 respectively, the negative electrode of a capacitor CA2 is grounded, and the positive electrode of the capacitor CA2 is connected with the other output end of the input module, a power supply pin of the driving chip U2, the negative electrode of a voltage regulator tube VR3 and the other end of the transformer T1 feedback winding respectively.
The model of the driving chip U2 is set as CR 6853.
The resistances of the resistors R12, 15, 25, 26 are set to 150K Ω.
The regulated voltage of the regulator tube VR3 is set to 30V.
The utility model has the advantages that: a high-power flyback switching power supply comprises an input module, a main control module and an output module which are connected in sequence, wherein the input module is connected with an external power supply, the output module supplies power to a load, and the main control module comprises a driving chip U2, a transformer T1, an MOS tube Q1, resistors R5-7, 12, 15, 25, 26 and 27, diodes D5 and 8, a voltage regulator VR3 and a capacitor CA 2; the resistors R5-7 and 12 are connected in parallel to reduce sampling voltage, the problem that the sampling resistor generates heat after the current is increased is solved, the voltage stabilizing tube VR3 is added to clamp a power supply pin of the driving chip U2, the driving chip U2 cannot enter overvoltage protection, the peak absorption resistor structure is improved, the absorption depth can be increased, the problem of high power consumption after the absorption depth is increased is solved, and the requirement that the switching power supply can output high power to meet the power amplifier of the sound equipment is met.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a circuit diagram of a high-power flyback switching power supply;
FIG. 2 is a circuit diagram of an input module;
FIG. 3 is a circuit diagram of a master control module;
fig. 4 is a circuit diagram of an output module.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as excluding the number, and the terms greater than, less than, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly defined, the terms "set," "mounted," "connected," and the like are to be understood in a broad sense, and may be directly connected or indirectly connected through an intermediate medium, for example; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.
Referring to fig. 1 to 4, a high-power flyback switching power supply includes an input module 10, a main control module 20, and an output module 30 connected in sequence, where the input module 10 is connected to an external power supply, the output module 30 supplies power to a load, the main control module 20 includes a driving chip U2, a transformer T1, a MOS transistor Q1, resistors R5-7, 12, 15, 25, 26, 27, diodes D5, 8, a voltage regulator VR3, and a capacitor CA2, one end of the resistor R12 is connected to an output end of the input module 10, one end of the resistor R25, one end of the resistor R15, one end of the resistor R26, a negative electrode of the diode D5, a negative electrode of the diode D8, and one end of a primary winding of the transformer, the other end of the resistor R12 is connected to the other end of the resistor R15, the other end of the resistor R26, and the other end of the resistor R25, and an anode of the diode D5 is connected to an anode of the diode D8, The other end of the primary winding of the transformer T1, the drain, the source and the gate of the MOS transistor Q1, one end of a resistor R6, one end of a resistor R5, one end of a resistor R7, one end of a resistor R27, the output pin and the chip selection pin of the driving chip U2 are connected, the other end of the resistor R6 is respectively connected with one end of a feedback winding of the transformer T1, the other end of a resistor R5, the other end of the resistor R7, the other end of the resistor R27, the grounding end and the chip selection pin of the driving chip U2, the negative electrode of the capacitor CA2 is grounded, and the positive electrode of the capacitor CA2 is respectively connected with the other output end of the input module 10, the power supply pin of the driving chip U2, the negative electrode of the VR3 and the other end of the feedback winding of the transformer T1.
The utility model discloses in, external power source is connected to input module 10, external power source provides voltage for switching power supply, input module 10 provides voltage for the back stage circuit after carrying out filtering and rectification to the voltage that the input came in, main control module 20 is used for controlling the voltage of output module 30 output, it is concrete, sampling to the voltage of the feedback winding on transformer T1 through the sampling circuit that resistance R5-7, 27 are constituteed, and feed back the sampling result to in driving chip U2, sampling circuit adopts 4 resistance constitutions, can reduce sampling voltage, the problem that the resistance generates heat after the current increase has also been solved simultaneously; the voltage of a power supply pin of the driving chip U2 is clamped through a voltage regulator VR3, preferably, the stable voltage of a voltage regulator VR3 is set to be 30V, the peak voltage exceeding 33V on the capacitor CA2 can be clamped to be 30V, and the driving chip U2 is prevented from entering overvoltage protection; further, the peak absorption circuit composed of the resistors R12, 15, 25 and 26, and the resistance values of the resistors R12, 15, 25 and 26 are set to 150K omega, the peak absorption depth can be increased, and the diodes D5 and D8 are arranged to solve the heating problem caused by power consumption increase after the peak absorption depth is deepened.
The model of the driving chip U2 is set as CR 6853.
The resistances of the resistors R12, 15, 25, 26 are set to 150K Ω.
The regulated voltage of the regulator tube VR3 is set to 30V.
Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are included in the scope defined by the claims of the present application.
Claims (4)
1. A high-power flyback switching power supply comprises an input module (10), a main control module (20) and an output module (30) which are sequentially connected, wherein the input module (10) is connected with an external power supply, and the output module (30) supplies power to a load, and is characterized in that the main control module (20) comprises a driving chip U2, a transformer T1, a MOS tube Q1, resistors R5-7, 12, 15, 25, 26, 27, diodes D5, 8, a voltage stabilizing tube VR3 and a capacitor CA2, one end of a resistor R12 is respectively connected with one output end of the input module (10), one end of a resistor R25, one end of a resistor R15, one end of a resistor R26, the cathode of a diode D5, the cathode of a diode D8 and one end of a primary winding of the transformer, the other end of a resistor R12 is respectively connected with the other end of a resistor R15, the other end of a resistor R26 and the other end of a resistor R25, and the anode of a diode D5 is respectively connected with the anode of a diode D8, The other end of the primary winding of the transformer T1, the drain, the source and the gate of the MOS tube Q1, one end of a resistor R6, one end of a resistor R5, one end of a resistor R7, one end of a resistor R27, the output pin and the chip selection pin of the driving chip U2 are connected, the other end of the resistor R6 is respectively connected with one end of a feedback winding of the transformer T1, the other end of a resistor R5, the other end of the resistor R7, the other end of the resistor R27, the grounding end and the chip selection pin of the driving chip U2, the negative electrode of the capacitor CA2 is grounded, and the positive electrode of the capacitor CA2 is respectively connected with the other output end of the input module (10), the power supply pin of the driving chip U2, the negative electrode of the VR3 and the other end of the feedback winding of the transformer T1.
2. A high power flyback switching power supply as claimed in claim 1, wherein: the model of the driving chip U2 is set as CR 6853.
3. A high power flyback switching power supply as claimed in claim 1, wherein: the resistances of the resistors R12, 15, 25, 26 are set to 150K Ω.
4. A high power flyback switching power supply as claimed in claim 1, wherein: the regulated voltage of the regulator tube VR3 is set to 30V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023226272.3U CN214069817U (en) | 2020-12-28 | 2020-12-28 | High-power flyback switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023226272.3U CN214069817U (en) | 2020-12-28 | 2020-12-28 | High-power flyback switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214069817U true CN214069817U (en) | 2021-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023226272.3U Active CN214069817U (en) | 2020-12-28 | 2020-12-28 | High-power flyback switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214069817U (en) |
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2020
- 2020-12-28 CN CN202023226272.3U patent/CN214069817U/en active Active
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